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Atg1 is a kinase upregulated upon induction of autophagy. Atg13 regulates Atg1 and together they form a complex called Atg13:Atg1, which receives signals from the master of nutrient sensing – Tor. Atg1 is also important in late stages of autophagosome formation.
Autophagy degrades damaged organelles, cell membranes and proteins, and insufficient autophagy is thought to be one of the main reasons for the accumulation of damaged cells and aging. [87] Autophagy and autophagy regulators are involved in response to lysosomal damage, often directed by galectins such as galectin-3 and galectin-8 .
AuTophaGy related 1 (Atg1) is a 101.7kDa serine/threonine kinase in S.cerevisiae, encoded by the gene ATG1. [1] It is essential for the initial building of the autophagosome and Cvt vesicles. In a non-kinase role it is - through complex formation with Atg13 and Atg17 - directly controlled by the TOR kinase , a sensor for nutrient availability.
Atg8 is one of the key molecular components involved in autophagy, the cellular process mediating the lysosome/vacuole-dependent turnover of macromolecules and organelles. [5] Autophagy is induced upon nutrient depletion or rapamycin treatment and leads to the response of more than 30 autophagy-related (ATG) genes known so far, including ATG8.
Microautophagy is one of the three common forms of autophagic pathway, but unlike macroautophagy and chaperone-mediated autophagy, it is mediated—in mammals by lysosomal action or in plants and fungi by vacuolar action—by direct engulfment of the cytoplasmic cargo.
Autophagy is the major intracellular degradation system delivering cytoplasmic components to lysosomes, and it accounts for degradation of most long-lived proteins and some organelles. Cytoplasmic constituents, including organelles, are sequestered into double-membraned autophagosomes, which subsequently fuse with lysosomes.
CMA performs various specialized functions as well, depending on the specific protein undergoing degradation through this pathway and the cell type involved. For example, known CMA substrates include, MEF2D, a neuronal factor important for survival; Pax2, a transcription factor, important for the regulation growth of renal tubular cells; IκBα ...
Autophagy protein 5 (ATG5) is a protein that, in humans, is encoded by the ATG5 gene located on chromosome 6. It is an E3 ubi autophagic cell death . ATG5 is a key protein involved in the extension of the phagophoric membrane in autophagic vesicles.